Converts page to the target type file format with sepcified file name and saves it to a file on the local disk.
Throw an exception in condition:
1: the target context type has not been developed yet.
2: the required assembly has not been added.

Converts page to the target type file format with sepcified file name and saves it to a file on the local disk.
Throw an exception in condition:
1: the target context type has not been developed yet.
2: the required assembly has not been added.